Check out http://www.3dprintlabs.com. I saw a video.of a 3d printed P38 Lightning . All panels and ribs are 3d printed,The end result is amazing, and they do fly well.I just updated my 3d printer and I am going to attempt to build the Piper PawneeHere is a video of the 3d printed P38

After watching the FliteTest video it got me motivated to upgrade my 3D printer, purchase plans from 3dlabprint, and build a 3d printed airplaneto test at the farm. Here's a photo of the printer in action

Here's a photo of the parts I've printed so far. I have 30 more parts to print before I start the assembly.